$ git clone -n https://src.fedoraproject.org/rpms/python-multiecho.git /var/lib/mock/f42-build-side-1-3501672-45976/root/chroot_tmpdir/scmroot/python-multiecho
Cloning into '/var/lib/mock/f42-build-side-1-3501672-45976/root/chroot_tmpdir/scmroot/python-multiecho'...
$ git fetch origin 154e4dd64b986f48600e64d89a23963a620ac11e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-multiecho
 * [new ref]         154e4dd64b986f48600e64d89a23963a620ac11e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 154e4dd Update to 0.30 (close RHBZ#2349507)